Am Montag, 23. Mai 2005 06.54 schrieb Wijaya Edward:
> That's very clever John,
> I'm wondering why ($cnt++) won't work instead of this
>
> > recursive(++$cnt) if $cnt<10;
>
> I tested it, it gave endless recursion.
Yes, spontaneosly I used $cnt++ first, too :-)
++$cnt is called "pre increment" - in contrast to $cnt++ ("post increment") -
and means that $cnt is incremented _before_ the incremented value is used.
So,
recursive(++$cnt);
first increments $cnt and then passes it to recursive().
recursive($cnt++);
always passes the same value to recursive() and increments it afterwards (but
this incremented value is never used).
see (from cmd line)
perldoc perlop
>
> And what's the meaning of "0" here?
> Why didn't you pass "1" as for recursive(1),
> which is more sensible to me? Which also works.
>
> > recursive(0);
I tend to count levels from 0, not 1, that's all.
regards, joe
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